Battery cover plate having explosion-proof valve connected by means of plastic

Abstract

A battery cover plate, comprising a cover plate body (1). The cover plate body (1) is provided with a mounting recess (2), an explosion-proof valve (3) is mounted in the mounting recess (2), at least one blasting line is provided on at least one surface of the explosion-proof valve (3), the explosion-proof valve (3) is provided with a first injection molding surface on the outer side of the blasting line, and the first injection molding surface and a second injection molding surface of the mounting recess (2) are provided with a plastic layer (4) which is formed by means of integral injection molding. The explosion-proof valve (3) and the cover plate body (1) are fixedly connected by means of the plastic layer (4), and an existing laser welding connection fixing process is replaced, thereby avoiding adverse effects caused by high temperature in the laser welding process, achieving a stable explosion-proof value, improving the yield, and reducing the manufacturing cost.

Description

A battery cover connected to an explosion-proof valve through plastic

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202320276267.8 and application date of February 22, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present invention relates to the technical field of battery covers, and in particular to a battery cover connected to an explosion-proof valve via plastic. Background Art

[0004] The battery cover is a crucial component on a single battery cell. Its complex structure primarily consists of components such as an explosion-proof disc, a flip-up disc, and a terminal. The main production processes for the cover include stamping, welding, and injection molding, while the production processes for the shell primarily involve stamping and stretching. The main functions of the cover include securing / sealing, conducting current, providing pressure relief, providing fuse protection, and reducing electrical corrosion. The explosion-proof valves on all existing square or round battery covers are typically made of aluminum, stamped and then welded to the cover body.

[0005] The manufacturing of traditional battery covers requires high part precision and welding. The welding process is a mid-stage or late-stage process. If a defect occurs, the related parts and processes will be scrapped together, resulting in great losses and a decrease in the overall product qualification rate. In addition, during the welding process, the high temperature will have varying degrees of annealing effect on the material of the explosion-proof plate, resulting in a large tolerance of the explosion-proof value (typically ±0.2MPa). The welding process is cumbersome and the manufacturing cost is high. Therefore, we have proposed a battery cover with an explosion-proof valve connected by plastic to solve the above problems.

[0006] Summary of the Invention

[0007] An embodiment of the present invention provides a battery cover connected to an explosion-proof valve via plastic to solve the problems raised in the above background technology.

[0008] In order to achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0009] A battery cover connected to an explosion-proof valve via plastic includes a cover body, a mounting groove formed on the cover body, an explosion-proof valve mounted in the mounting groove, at least one surface of the explosion-proof valve having at least one bursting line formed thereon, the explosion-proof valve having a first injection-molded surface outside the bursting line, and a plastic layer obtained by integral injection molding being formed on the first injection-molded surface and the second injection-molded surface of the mounting groove, the plastic layer and the explosion-proof valve together sealing the mounting groove.

[0010] In one embodiment, a step is provided in the installation groove, the explosion-proof valve is provided on the step, and the first injection molding surface is provided on the surface of the explosion-proof valve facing away from the step.

[0011] In one embodiment, the explosion-proof valve is provided with at least one through hole at a predetermined distance outside the bursting line, and the second injection molding surface includes: a first sub-injection molding surface located on one side of the through hole, and a second sub-injection molding surface located on the other side of the through hole, and the plastic layer passes through the through hole and adheres to the first sub-injection molding surface and the second sub-injection molding surface.

[0012] In one embodiment, at least one of the second injection molding surface of the mounting groove and the second injection molding surface of the explosion-proof valve has a nanoporous structure.

[0013] In one embodiment, the bursting line corresponds to the shape of the explosion-proof valve.

[0014] In one embodiment, the explosion-proof valve is circular or rectangular.

[0015] In one embodiment, the cover body and the explosion-proof valve are both made of aluminum alloy.

[0016] In one embodiment, the plastic layer is made of plastic material.

[0017] In one embodiment, the explosion-proof valve is made by stamping.

[0018] The beneficial effects of the embodiments of the present invention are:

[0019] The device fixes the explosion-proof valve to the cover body through plastic connection, replacing the industry's existing laser welding connection and fixing process, thereby avoiding the adverse effects of high temperature during the laser welding process. The explosion-proof value is stable and the tolerance can be achieved at ±0.1MPa. At the same time, the welding process is eliminated, which improves the yield and reduces manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of an embodiment of the present invention;

[0021] FIG2 is a schematic structural diagram of explosion-proof valves of different shapes according to an embodiment of the present invention;

[0022] FIG3 is a schematic structural diagram of a cross section of FIG1 according to an embodiment of the present invention;

[0023] FIG4 is a schematic structural diagram of the cross section of FIG2 according to an embodiment of the present invention.

[0024] Numbers in the figure: 1, cover body; 2, mounting groove; 3, explosion-proof valve; 4, plastic; 5, first sub-injection surface; 6, second sub-injection surface; 7, through hole. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] 1 to 4 , an embodiment of the present invention provides a battery cover connected to an explosion-proof valve by plastic, comprising a cover body 1, a mounting groove 2 being provided on the cover body 1, an explosion-proof valve 3 being installed in the mounting groove 2, at least one surface of the explosion-proof valve 3 being provided with at least one bursting line, the explosion-proof valve 3 being provided with a first injection-molded surface on the outside of the bursting line, a plastic layer 4 obtained by integral injection molding being provided on the first injection-molded surface and the second injection-molded surface of the mounting groove 2, the plastic layer 4 and the explosion-proof valve 3 being sealed together with the mounting groove 2, a step being provided in the mounting groove 2, the explosion-proof valve 3 being provided on the step, and the first injection-molded surface being provided on the back of the explosion-proof valve 3 On the surface of the step, the explosion-proof valve 3 is provided with at least one through hole 7 at a predetermined distance outside the blasting line. The second injection molding surface includes: a first sub-injection molding surface 5 located on one side of the through hole 7, and a second sub-injection molding surface 6 located on the other side of the through hole 7. The plastic layer 4 passes through the through hole 7 and adheres to the first sub-injection molding surface 5 and the second sub-injection molding surface 6. It is connected by nano injection molding, replacing the existing laser welding connection and fixing process in the industry, thereby avoiding the adverse effects of high temperature in the laser welding process, and the explosion-proof value is stable with a tolerance of ±0.1MPa. At the same time, the welding process is eliminated, which improves the yield and reduces the manufacturing cost.

[0027] At least one of the second injection molding surface of the mounting groove 2 and the second injection molding surface of the explosion-proof valve 3 has a nanoporous structure. The nanoporous structure can be obtained by chemical corrosion or laser etching. The bursting line corresponds to the shape of the explosion-proof valve 3. The explosion-proof valve 3 is circular or rectangular. The cover body 1 and the explosion-proof valve 3 are both made of aluminum alloy. The cover body may be made of stainless steel. The plastic layer 4 is made of plastic material (PPS plastic, L7P plastic, PEEK plastic, P6T plastic, PI plastic). The explosion-proof valve 3 is made by stamping.

[0028] The working principle of the embodiment of the present invention is: the cover body 1 and the explosion-proof valve 3 are stamped into shape (the notches are not processed for the time being), and then the cover body 1 and the explosion-proof valve 3 are subjected to surface chemical or physical laser treatment to form nanopores, and the explosion-proof valve of the required shape is selected, and the cover body 1 and the explosion-proof valve 3 are placed in a plastic mold, and nano-injection molding is performed to form plastic 4. Finally, the surface of the explosion-proof valve 3 is processed and notched (the notch processing can also be achieved by pressing and forming the injection mold during the injection molding process), and the explosion-proof valve 3 is connected and fixed to the cover body 1 through the plastic 4, replacing the existing laser welding connection and fixing process in the industry, thereby avoiding the adverse effects of high temperature during the laser welding process, and the explosion-proof value is stable, and the tolerance can be achieved by ±0.1MPa. At the same time, the welding process is eliminated, thereby improving the yield and reducing the manufacturing cost.

[0029] The above description is only a preferred specific implementation of the embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions of the embodiments of the present invention and the concepts of the embodiments of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A battery cover connected to an explosion-proof valve by plastic, comprising a cover body, a mounting groove provided on the cover body, an explosion-proof valve installed in the mounting groove, at least one surface of the explosion-proof valve provided with at least one bursting line, the explosion-proof valve is provided with a first injection molding surface outside the bursting line, a plastic layer obtained by integral injection molding is provided on the first injection molding surface and the second injection molding surface of the mounting groove, and the plastic layer and the explosion-proof valve together seal the mounting groove.

2. According to the battery cover plate connected with an explosion-proof valve by plastic in claim 1, a step is provided in the mounting groove, the explosion-proof valve is provided on the step, and the first injection molding surface is provided on the surface of the explosion-proof valve facing away from the step.

3. A battery cover plate connected to an explosion-proof valve by plastic according to claim 1, wherein the explosion-proof valve is provided with at least one through hole at a predetermined distance outside the bursting line, and the second injection molding surface comprises: A first sub-injection surface is located at one side of the through hole, and a second sub-injection surface is located at the other side of the through hole. The plastic layer penetrates the through hole and adheres to the first sub-injection surface and the second sub-injection surface.

4. A battery cover connected to an explosion-proof valve by plastic according to any one of claims 1 to 3, wherein at least one of the second injection molding surface of the mounting groove and the second injection molding surface of the explosion-proof valve has a nanoporous structure.

5. A battery cover connected to an explosion-proof valve by plastic according to any one of claims 1 to 3, wherein the bursting line corresponds to the shape of the explosion-proof valve.

6. A battery cover plate connected to an explosion-proof valve by plastic according to any one of claims 1 to 3, wherein the explosion-proof valve is circular or rectangular.

7. A battery cover connected to an explosion-proof valve by plastic according to any one of claims 1 to 3, wherein the cover body and the explosion-proof valve are both made of aluminum alloy.

8. A battery cover connected to an explosion-proof valve via plastic according to any one of claims 1 to 3, wherein the plastic layer is made of plastic material.

9. A battery cover plate connected to an explosion-proof valve by plastic according to any one of claims 1 to 3, wherein the explosion-proof valve is made by stamping.

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